-Var 
var varName;

-Data Types

typeof(varName)  = 
	“undefined” 
	“boolean” 
	“string”
	“number”
	“object” : object or null
	“function” if the value is a function

- "window" is implicit
window.document.write() is replaced by
document.write()

-objID getElementById(element)
refer to html element

Event Handlers
  var USER_COLOR = window.prompt("Enter a color.", "");